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I'm not really sure what could be causing it. It must be something in the air because my new white Toyota Tundra exhibits the same thing after one winter. There are no train tracks around our neighborhood. The only thing I can think of is a foundry, but it is over a mile away. I wonder if iron dust is sticking to the paint and over the course of the winter, salt causes it to rust?

I'll try the clay bar. Thanks!